Peel guavas thinly (spud peeler works well).
Cut in half, scoop out seeds and chop the fruit into smallish pieces.
For each cup of chopped guavas add ¾ cup sugar.
Bring to boil in pot, stirring to dissolve sugar, then simmer gently uncovered approx. 40-50 minutes with occasional stirring.
For a more even consistency give a short beat with beaters on slow speed (eg. bar-mix or mixmaster).
When thick enough for jam, pour into clean dry jars and seal while still warm.
Note – test consistency by placing small amount on saucer in fridge, as it will be thicker when it cools.
From Rae Marnham